This Cummins fault 629 document is a troubleshooting manual for Turbocharger 1 Compressor Inlet Pressure faults on CM2250 engines. It explains the circuit description, fault-code conditions, diagnostic steps, repair checks, ECM calibration review, and clearing procedure for Code 629.
Official Cummins fault 629 document details
| Brand | Cummins |
|---|---|
| Model coverage | ISX11.9 CM2250 and ISX15 CM2250 |
| System/Group | ISB6.7 CM2250 (2010-12) / DTCs |
| Publication no. | Not shown in the extract |
| Year/Revision | Last Modified: 18-Jan-2011; summary section Last Modified: 11-Jun-2010 |
| Pages | 12 |
| File size | 0.2 MB |
| Format | |
| Language | English |
Document table of contents
- Overview
- Circuit Description
- Component Location
- Conditions for Running the Diagnostics
- Conditions for Setting the Fault Codes
- Action Taken When the Fault Code is Active
- Conditions for Clearing the Fault Code
- Shop Talk
- Associated Procedures
- Troubleshooting Steps
- Guided Step 1 – Check the fault codes.
- Guided Step 2 – Check the crankcase ventilation system.
- Guided Step 3 – Check the intake system.
- Guided Step 4 – Check for oil in the compressor discharge pipe.
- Guided Step 5 – Check ECM calibration and clear fault codes.
Applicable truck models
This file applies to Cummins ISX11.9 CM2250 and ISX15 CM2250 engines as shown in the associated procedures table. The fault is identified as Fault Code: 629, PID: P314, SPN: 1176, FMI: 1/18, with an amber lamp and an engine torque derate when active. The document states that the ECM calculates differential pressure across the turbocharger using the intake manifold pressure sensor and crankcase pressure sensor. The intake manifold pressure sensor is located in the air intake horn, and the crankcase pressure sensor is mounted to the crankcase breather filter housing. For official manufacturer information, visit Cummins.
Who needs this Cummins fault 629 manual
Mechanics, fleet technicians, and workshop owners need this manual when diagnosing low turbocharger compressor inlet pressure, air intake restriction, crankcase ventilation restriction, or related sensor faults. It is also useful when checking INSITE readings against a mechanical gauge, inspecting air filter and intake plumbing restriction, checking oil in the compressor discharge pipe or charge-air cooler, and reviewing ECM calibration code revisions.
The procedure directs technicians to check whether Fault Code 555, 556, or 125 is active or inactive before replacing parts. It references Procedure 010-031 for air intake restriction, Procedure 010-033 for turbocharger service, Procedure 010-027 for charge-air cooler inspection, Procedure 019-159 for the intake manifold pressure/temperature sensor, and Procedure 019-032 for ECM calibration code work. Possible causes listed in the file include a plugged or restricted air filter, a plugged crankcase breather filter, and restricted crankcase breather plumbing. The repair validation step is to start the engine and let it idle for 1 minute, then confirm that INSITE shows the fault inactive and that the amber CHECK ENGINE lamp turns off after the diagnostic passes.
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